Journal
JOURNAL OF LUMINESCENCE
Volume 130, Issue 12, Pages 2452-2459Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2010.08.011
Keywords
Nanoparticles; Luminescence; Quantum yield
Categories
Funding
- CSIR, New Delhi
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Highly crystalline spherical nanoparticles of MVO4:Tm3+ (M=Gd, Y) having a size of 20-45 nm were prepared using ethylene glycol as both capping agent and reaction medium. X-ray diffraction study shows linear decrease in the unit cell volume with an increase in Tm3+ concentrations in MVO4 (M=Gd, Y; Tm3+=0, 2, 5, 7, 10, 15, 20, 40, 60, 80 and 100 at%), indicative of quantitative substitution of Gd3+/Y3+ lattice sites by Tm3+ ions in MVO4. Blue light emission at 475 nm is observed after excitation at 310 nm due to energy transfer from VO43- absorption band to Tm3+. Emission intensity and average decay lifetime increase with an increase in heat treatment from 500 to 900 degrees C. This has been attributed to an extent of reduction in non-radiative process arising from surface. The emission intensity of Tm3+ in GdVO4 host is higher than that in YVO4 and thus the former host is better. Quantum yield increases with increase in heat-treatment temperature. This material will be the alternative blue light emitter. (C) 2010 Elsevier B.V. All rights reserved.
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